Associate each region with an independent backoffer (#17568) #17585
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cherry-pick #17568 to release-4.0
Signed-off-by: Xintao hunterlxt@live.com
What problem does this PR solve?
Issue Number: close tikv/tikv#7853
Problem Summary:
The backoffer of the boRegionMiss has a backoff mechanism with a starting time of 2ms and a maximum of 500ms. After log verification, a SQL command will share the same backoffer, that is, if multiple regions return epoch not match error, then the backoffer will quickly rise to 500ms. It is easy to exceed the preset time limit of 40s, causing SQL errors on the client.
What is changed and how it works?
What's Changed: Add a function to get Backoffer
How it Works: Use a Map to store backoffer with specific region id
Related changes
Check List
Tests
Before this PR, the SQL usually returns
region is unavailableSide effects
No
Release note
Backofferfor each region to avoid the SQL command timeout issue when multiple region requests fail at the same time